| Band | Genre |
|---|---|
| Ian Gillan | Hard Rock |
| Iced Earth | Power Metal |
| Ill Niño | Nu Metal |
| Immortal | Black/Death Metal/Hardcore |
| Impellitteri | Heavy metal |
| In Extremo | Folk Rock |
| In Flames | Black/Death Metal/Hardcore |
| Incubus (UK) | Heavy metal |
| Incubus (USA) | Black/Death Metal/Hardcore |
| Incubus (USA, Alt.) | Alternative Rock |
| Insomnium | Black/Death Metal/Hardcore |
| Iron Maiden | Heavy metal |
| Iron Reagan | Thrash Metal |
